public async Task <IActionResult> LinkLoginCallback()
{
var user = await _userManager.GetUserAsync(User);
if (user == null)
{
throw new ApplicationException($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
}
var info = await _signInManager.GetExternalLoginInfoAsync(user.Id);
if (info == null)
{
throw new ApplicationException($"Unexpected error occurred loading external login info for user with ID '{user.Id}'.");
}
var result = await _userManager.AddLoginAsync(user, info);
if (!result.Succeeded)
{
throw new ApplicationException($"Unexpected error occurred adding external login for user with ID '{user.Id}'.");
}
// Clear the existing external cookie to ensure a clean login process
await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);
StatusMessage = "The external login was added.";
return(RedirectToAction(nameof(ExternalLogins)));
}